Non-heading Chinese cabbage (Brassica campestris ssp.chinensis Makino) is one of the most important vegetables in eastern China.Purple flower stalk (B.campestris ssp.chinensis Makino var.utilis Tsen et Lee)is one of the variety of Non-heading Chinese cabbage.To identify the genes responsible for varietal differences in bolting time in Purple flower stalk, a genetic linkage map was constructed, using a doubled-haploid (DH) population with 140 individuals, and the DH population was derived from F1 which was developed by crossing a bolting resistant DH line 4-1 and an easy bolting high inbred line 040-3.The segregation of each marker and linkage was analyzed by using JoinMap version 3.0.One hundred and thirty-eight molecular markers were mapped into 10 LGs, which were anchored to the corresponding chromosome of the B.rapa reference map based on common simple sequence repeat (SSR) markers.The map covers 1253.1 cM, with an average distance of 9.08 cM between adjacent marker loci.Markers showing skewed segregation ratio were clustered in five LGs.Quantitative trait loci (QTL) were mapped for bolting resistance by using MAPQTL 3.0 package.Four QTLs explaining from 17.7 to 42.7% of the total variation were detected, all of them increase bolting resistance.These mapped QTLs could be used to develop a marker assisted selection program for bolting resistance breeding.